A Novel BiFeO3-BaTiO3-BaZrO3 Lead-Free Relaxor Ferroelectric Ceramic with Low-Hysteresis and Frequency-Insensitive Large Strains

作者：Zheng, Donggeng; Zuo, Ruzhong^*

来源：Journal of the American Ceramic Society, 2015, 98(12): 3670-3672.

DOI：10.1111/jace.13989

• Dielectric permittivities
• Dielectric relaxor
• Ferroelectric phasis
• Forward-and-backward
• Lead-free relaxor
• Measurements of
• Solid state reaction method
• Temperature dependent

A novel (0.67-x) BiFeO3-0.33BaTiO(3)-xBaZrO(3) lead-free relaxor ferroelectric ceramic was developed by a solid-state reaction method. Measurements of temperature-dependent dielectric permittivity and the polarization/ strain hysteresis loops demonstrated an obvious evolution of dielectric relaxor behavior at room temperature (RT) from nonergodic to ergodic states. A significantly enhanced electrostrain of similar to 0.37% at 7 kV/ mm with a relatively small hysteresis of similar to 39% and a low-frequency sensitivity was found at x = 0.04, showing large potential for actuator applications. This was basically attributed to a rapid response of forward and backward switching between ergodic and ferroelectric phases owing to similar free energies and large local random fields.

• 出版日期2015-12
• 单位合肥工业大学